tools/include/nolibc/Makefile | 2 +- tools/include/nolibc/arch-alpha.h | 162 +++++++++++++++++++++++++ tools/include/nolibc/arch.h | 2 + tools/testing/selftests/nolibc/Makefile.nolibc | 2 + tools/testing/selftests/nolibc/nolibc-test.c | 4 + tools/testing/selftests/nolibc/run-tests.sh | 3 +- 6 files changed, 173 insertions(+), 2 deletions(-)
A straightforward new architecture.
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
---
Only tested on QEMU so far.
Testing on real hardware would be very welcome.
Test instructions:
$ cd tools/testings/selftests/nolibc/
$ make -f Makefile.nolibc ARCH=alpha CROSS_COMPILE=alpha-linux- nolibc-test
$ file nolibc-test
nolibc-test: ELF 64-bit LSB executable, Alpha (unofficial), version 1 (SYSV), statically linked, not stripped
$ ./nolibc-test
Running test 'startup'
0 argc = 1 [OK]
...
Total number of errors: 0
Exiting with status 0
---
Changes in v2:
- Add clobbers to system call arguments
- Adapt to new system call wrapper names
- Avoid multiple register variables with same register
- Expand comment about special brk handling
- Rebase on latest nolibc/for-next
- Link to v1: https://lore.kernel.org/r/20250713-nolibc-alpha-v1-1-10216333d308@weissschuh.net
---
tools/include/nolibc/Makefile | 2 +-
tools/include/nolibc/arch-alpha.h | 162 +++++++++++++++++++++++++
tools/include/nolibc/arch.h | 2 +
tools/testing/selftests/nolibc/Makefile.nolibc | 2 +
tools/testing/selftests/nolibc/nolibc-test.c | 4 +
tools/testing/selftests/nolibc/run-tests.sh | 3 +-
6 files changed, 173 insertions(+), 2 deletions(-)
diff --git a/tools/include/nolibc/Makefile b/tools/include/nolibc/Makefile
index 00fd2e566d75..6d213d372bf8 100644
--- a/tools/include/nolibc/Makefile
+++ b/tools/include/nolibc/Makefile
@@ -17,7 +17,7 @@ endif
# it defaults to this nolibc directory.
OUTPUT ?= $(CURDIR)/
-architectures := arm arm64 loongarch m68k mips openrisc parisc powerpc riscv s390 sh sparc x86
+architectures := alpha arm arm64 loongarch m68k mips openrisc parisc powerpc riscv s390 sh sparc x86
arch_files := arch.h $(addsuffix .h, $(addprefix arch-, $(architectures)))
all_files := \
alloca.h \
diff --git a/tools/include/nolibc/arch-alpha.h b/tools/include/nolibc/arch-alpha.h
new file mode 100644
index 000000000000..f6c0b905f594
--- /dev/null
+++ b/tools/include/nolibc/arch-alpha.h
@@ -0,0 +1,162 @@
+/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
+/*
+ * Alpha specific definitions for NOLIBC
+ * Copyright (C) 2025 Thomas Weißschuh <linux@weissschuh.net>
+ */
+
+#ifndef _NOLIBC_ARCH_ALPHA_H
+#define _NOLIBC_ARCH_ALPHA_H
+
+#include "compiler.h"
+#include "crt.h"
+
+/*
+ * Syscalls for Alpha:
+ * - registers are 64-bit
+ * - syscall number is passed in $0/v0
+ * - the system call is performed by calling callsys
+ * - syscall return comes in $0/v0, error flag in $19/a4
+ * - arguments are passed in $16/a0 to $21/a5
+ * - GCC does not support symbol register names
+ */
+
+#define _NOLIBC_SYSCALL_CLOBBERLIST \
+ "$1", "$2", "$3", "$4", "$5", "$6", "$7", "$8", \
+ "$22", "$23", "$24", "$25", "$27", "$28", "memory", "cc"
+
+#define __nolibc_syscall0(num) \
+({ \
+ register long _num __asm__ ("$0") = (num); \
+ register long _err __asm__ ("$19"); \
+ \
+ __asm__ volatile ( \
+ "callsys" \
+ : "+r"(_num), "=r"(_err) \
+ : \
+ : _NOLIBC_SYSCALL_CLOBBERLIST, \
+ "$16", "$17", "$18", "$20", "$21" \
+ ); \
+ _err ? -_num : _num; \
+})
+
+#define __nolibc_syscall1(num, arg1) \
+({ \
+ register long _num __asm__ ("$0") = (num); \
+ register long _err __asm__ ("$19"); \
+ register long _arg1 __asm__ ("$16") = (long)(arg1); \
+ \
+ __asm__ volatile ( \
+ "callsys" \
+ : "+r"(_num), "=r"(_err) \
+ : "r"(_arg1) \
+ : _NOLIBC_SYSCALL_CLOBBERLIST, "$17", "$18", "$20", "$21" \
+ ); \
+ _err ? -_num : _num; \
+})
+
+#define __nolibc_syscall2(num, arg1, arg2) \
+({ \
+ register long _num __asm__ ("$0") = (num); \
+ register long _err __asm__ ("$19"); \
+ register long _arg1 __asm__ ("$16") = (long)(arg1); \
+ register long _arg2 __asm__ ("$17") = (long)(arg2); \
+ \
+ __asm__ volatile ( \
+ "callsys" \
+ : "+r"(_num), "=r"(_err) \
+ : "r"(_arg1), "r"(_arg2) \
+ : _NOLIBC_SYSCALL_CLOBBERLIST, "$18", "$20", "$21" \
+ ); \
+ _err ? -_num : _num; \
+})
+
+#define __nolibc_syscall3(num, arg1, arg2, arg3) \
+({ \
+ register long _num __asm__ ("$0") = (num); \
+ register long _err __asm__ ("$19"); \
+ register long _arg1 __asm__ ("$16") = (long)(arg1); \
+ register long _arg2 __asm__ ("$17") = (long)(arg2); \
+ register long _arg3 __asm__ ("$18") = (long)(arg3); \
+ \
+ __asm__ volatile ( \
+ "callsys" \
+ : "+r"(_num), "=r"(_err) \
+ : "r"(_arg1), "r"(_arg2), "r"(_arg3) \
+ : _NOLIBC_SYSCALL_CLOBBERLIST, "$20", "$21" \
+ ); \
+ _err ? -_num : _num; \
+})
+
+#define __nolibc_syscall4(num, arg1, arg2, arg3, arg4) \
+({ \
+ register long _num __asm__ ("$0") = (num); \
+ register long _err __asm__ ("$19"); \
+ register long _arg1 __asm__ ("$16") = (long)(arg1); \
+ register long _arg2 __asm__ ("$17") = (long)(arg2); \
+ register long _arg3 __asm__ ("$18") = (long)(arg3); \
+ register long _arg4 __asm__ ("$19") = (long)(arg4); \
+ \
+ __asm__ volatile ( \
+ "callsys" \
+ : "+r"(_num), "=r"(_err) \
+ : "r"(_arg1), "r"(_arg2), "r"(_arg3), "r"(_arg4) \
+ : _NOLIBC_SYSCALL_CLOBBERLIST, "$20", "$21" \
+ ); \
+ _err ? -_num : _num; \
+})
+
+#define __nolibc_syscall5(num, arg1, arg2, arg3, arg4, arg5) \
+({ \
+ register long _num __asm__ ("$0") = (num); \
+ register long _err __asm__ ("$19"); \
+ register long _arg1 __asm__ ("$16") = (long)(arg1); \
+ register long _arg2 __asm__ ("$17") = (long)(arg2); \
+ register long _arg3 __asm__ ("$18") = (long)(arg3); \
+ register long _arg4 __asm__ ("$19") = (long)(arg4); \
+ register long _arg5 __asm__ ("$20") = (long)(arg5); \
+ \
+ __asm__ volatile ( \
+ "callsys" \
+ : "+r"(_num), "=r"(_err) \
+ : "r"(_arg1), "r"(_arg2), "r"(_arg3), "r"(_arg4), "r"(_arg5) \
+ : _NOLIBC_SYSCALL_CLOBBERLIST, "$21" \
+ ); \
+ _err ? -_num : _num; \
+})
+
+#define __nolibc_syscall6(num, arg1, arg2, arg3, arg4, arg5, arg6) \
+({ \
+ register long _num __asm__ ("$0") = (num); \
+ register long _err __asm__ ("$19"); \
+ register long _arg1 __asm__ ("$16") = (long)(arg1); \
+ register long _arg2 __asm__ ("$17") = (long)(arg2); \
+ register long _arg3 __asm__ ("$18") = (long)(arg3); \
+ register long _arg4 __asm__ ("$19") = (long)(arg4); \
+ register long _arg5 __asm__ ("$20") = (long)(arg5); \
+ register long _arg6 __asm__ ("$21") = (long)(arg6); \
+ \
+ __asm__ volatile ( \
+ "callsys" \
+ : "+r"(_num), "=r"(_err) \
+ : "r"(_arg1), "r"(_arg2), "r"(_arg3), "r"(_arg4), "r"(_arg5), \
+ "r"(_arg6) \
+ : _NOLIBC_SYSCALL_CLOBBERLIST \
+ ); \
+ _err ? -_num : _num; \
+})
+
+/* startup code */
+void __attribute__((weak, noreturn)) __nolibc_entrypoint __nolibc_no_stack_protector
+_start(void)
+{
+ __asm__ volatile (
+ "br $gp, 0f\n" /* setup $gp, so that 'lda' works */
+ "0: ldgp $gp, 0($gp)\n"
+ "lda $27, _start_c\n" /* setup current function address for _start_c */
+ "mov $sp, $16\n" /* save argc pointer to $16, as arg1 of _start_c */
+ "br _start_c\n" /* transfer to c runtime */
+ );
+ __nolibc_entrypoint_epilogue();
+}
+
+#endif /* _NOLIBC_ARCH_ALPHA_H */
diff --git a/tools/include/nolibc/arch.h b/tools/include/nolibc/arch.h
index b69d9c5ec5c6..06cc2dbe7a33 100644
--- a/tools/include/nolibc/arch.h
+++ b/tools/include/nolibc/arch.h
@@ -32,6 +32,8 @@
#include "arch-openrisc.h"
#elif defined(__hppa__)
#include "arch-parisc.h"
+#elif defined(__alpha__)
+#include "arch-alpha.h"
#else
#error Unsupported Architecture
#endif
diff --git a/tools/testing/selftests/nolibc/Makefile.nolibc b/tools/testing/selftests/nolibc/Makefile.nolibc
index 06f881e2e90c..f70c8dfca018 100644
--- a/tools/testing/selftests/nolibc/Makefile.nolibc
+++ b/tools/testing/selftests/nolibc/Makefile.nolibc
@@ -112,6 +112,7 @@ EXTRACONFIG_armthumb = -e CONFIG_NAMESPACES
EXTRACONFIG_sparc32 = -e CONFIG_TMPFS
EXTRACONFIG_m68k = -e CONFIG_BLK_DEV_INITRD
EXTRACONFIG_sh4 = -e CONFIG_BLK_DEV_INITRD -e CONFIG_CMDLINE_FROM_BOOTLOADER
+EXTRACONFIG_alpha = -e CONFIG_BLK_DEV_INITRD
EXTRACONFIG = $(EXTRACONFIG_$(XARCH))
# optional tests to run (default = all)
@@ -174,6 +175,7 @@ QEMU_ARGS_m68k = -M virt -append "console=ttyGF0,115200 panic=-1 $(TEST:%=
QEMU_ARGS_sh4 = -M r2d -serial file:/dev/stdout -append "console=ttySC1,115200 panic=-1 $(TEST:%=NOLIBC_TEST=%)"
QEMU_ARGS_openrisc = -M virt -m 512M -append "console=ttyS0 panic=-1 $(TEST:%=NOLIBC_TEST=%)"
QEMU_ARGS_parisc32 = -M B160L -append "console=ttyS0 panic=-1 $(TEST:%=NOLIBC_TEST=%)"
+QEMU_ARGS_alpha = -M clipper -append "console=ttyS0 panic=-1 $(TEST:%=NOLIBC_TEST=%)"
QEMU_ARGS = -m 1G $(QEMU_ARGS_$(XARCH)) $(QEMU_ARGS_BIOS) $(QEMU_ARGS_EXTRA)
# OUTPUT is only set when run from the main makefile, otherwise
diff --git a/tools/testing/selftests/nolibc/nolibc-test.c b/tools/testing/selftests/nolibc/nolibc-test.c
index 996e8d13508e..66accf99f560 100644
--- a/tools/testing/selftests/nolibc/nolibc-test.c
+++ b/tools/testing/selftests/nolibc/nolibc-test.c
@@ -756,6 +756,10 @@ int run_startup(int min, int max)
/* checking NULL for argv/argv0, environ and _auxv is not enough, let's compare with sbrk(0) or &end */
extern char end;
char *brk = sbrk(0) != (void *)-1 ? sbrk(0) : &end;
+#if defined(__alpha__)
+ /* the ordering above does not work on an alpha kernel due to STACK_TOP != TASK_SIZEi */
+ brk = NULL;
+#endif
/* differ from nolibc, both glibc and musl have no global _auxv */
const unsigned long *test_auxv = (void *)-1;
#ifdef NOLIBC
diff --git a/tools/testing/selftests/nolibc/run-tests.sh b/tools/testing/selftests/nolibc/run-tests.sh
index 6460e25001de..dc0b1649c641 100755
--- a/tools/testing/selftests/nolibc/run-tests.sh
+++ b/tools/testing/selftests/nolibc/run-tests.sh
@@ -30,6 +30,7 @@ all_archs=(
m68k
sh4
parisc32
+ alpha
)
archs="${all_archs[@]}"
@@ -193,7 +194,7 @@ test_arch() {
exit 1
esac
printf '%-15s' "$arch:"
- if [ "$arch" = "m68k" -o "$arch" = "sh4" -o "$arch" = "openrisc" -o "$arch" = "parisc32" ] && [ "$llvm" = "1" ]; then
+ if [ "$arch" = "m68k" -o "$arch" = "sh4" -o "$arch" = "openrisc" -o "$arch" = "parisc32" -o "$arch" = "alpha" ] && [ "$llvm" = "1" ]; then
echo "Unsupported configuration"
return
fi
---
base-commit: 070cf03f5ec454eec9c42827ee9f3c0b3fad09f1
change-id: 20250609-nolibc-alpha-33e79644544c
Best regards,
--
Thomas Weißschuh <linux@weissschuh.net>
© 2016 - 2026 Red Hat, Inc.